Today on the First 40 Miles, are you sure you want to go backpacking?  Do you know what you’re signing up for?  We’ll wisen you up a little.  On today’s Top 5 List, learn what not to do on your first backpacking trip.  And if you’re looking for a way to compress your gear, here's a stashable water bottle option.  For the Backpack Hack of the Week, learn where to borrow backpacking gear before you buy.